Ultra-high resolution filter and optical field modulator based on a surface plasmon polariton

A new filter structure and optical field modulator with ultra-high resolution based on plasmonic nano-cavity resonators is proposed and numerically investigated. The structure consists of a square nano-cavity resonator connected with several waveguides. All waveguides and cavity are etched on a silver film whose size is 1.1 x 0.75 mu m. Compared with traditional filters, the FWHM (full width at half-maximum) of this structure's spectrum curve can be less than 7 nm; namely, the resolution has been greatly improved. The structure also presents the feature of an optical field modulator when both inputs are working simultaneously, and it provides a promising way to design and manufacture future optical logical device. (C) 2016 Optical Society of AmericaNational Natural Science Foundation of China (NSFC) [60907003]; Foundation of NUDT [JC13-02-13]; Natural Science Foundation of Hunan Province [13JJ3001]; Program for New Century Excellent Talents in University (NCET) [NCET-12-0142]SCI(E)EIARTICLEyangjunbo008@sohu.com102310-23134